The HJS say the mosque has links to 19 jihadists, including Mohammed Emwazi, the Isis murderer also known as Jihadi John.

Others with links include Choukri Ellekhlifi, Alexanda Kotey and Aine Davis. Ellekhlifi was killed in 2013 near Aleppo, Syria.

Kotey is currently in solitary confinement in Syria accused of being an Isis bodyguard while Davis was present for the beheadings of hostages, including British aid workers Alan Henning and David Haines.

Meghan has been cooking with the community to raise funds in the wake of the Grenfell disaster (Picture: Rex)

There is no suggestion the mosque or Darwish supported their activities.

The main preacher, Darwish, has also used YouTube to promote extreme views about the rights of women.

Dr Alan Mendoza, executive director of the HJS, said the Duchess of Sussex had been ‘poorly advised’ over her involvement with the mosque.

‘This is not one or two isolated cases but 19 separate individuals.

Alexanda Kotey is linked to the mosque and has been accused of being a guard for Isis (Picture: Reuters)

‘A simple Google search would have highlighted concerns over these connections, and the recently expressed views of Imam Darwish.’

A Kensington Palace source said the ‘Hubb’ is an independent project that leases space from Al Manaar, adding: ‘The project is empowering the women and helping provide some hope and joy to a community that has gone through unspeakable tragedy.’

Abdulrahman Sayed, chief executive of Al Manaar, said: ‘Al Manaar has been on the record rejecting and condemning extremism and terrorism.’

He said the mosque could not be held responsible for anything Imam Darwish said outside its walls but added: ‘I’m happy to look at what he said and have a word with him about that language.’